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Sound field effect
transistor amplifier circuit

Field
effect transistors voice amplifier, the input impedance of the transistor is
low, only lkCZ, requiring signal source provides a constant current signal to
work. The field

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Circuits

The easiest musical
voice lights

220V
AC by Rl and R2 partial pressure, VD half-wave rectifier, the capacitor C in
the left ends of about 3V DC voltage right. Adjustment potentiometer RP, so
that the three-pol

Ballroom
synchronous voice switching circuit with music

Circuit
works: a circuit with condenser microphones to sense sound and converts it
into a signal changes, and then

HFC lantern making
music controller circuit

220V
AC power via VD1 ~ VD4 bridge rectifier and voltage regulator circuit through
R1, R2, VD5 cl composition and output

Sight n sound metronome

Precise,
adjustable control of beats per minute from a largo of 18 to a frenzied, high
presto of 500, These beats are produced acoustically through a speaker. A
light flashes at the same rate. When SW1 is closed, CI begins to charge
through Rl and R2. Cl will eventually reach a voltage at which the emitter of
unijunction transistor is switched...

Fuzz box 1

The
input signal is amplified by the transistors. The distorted output is then
clipped by the two diodes and the high frequency noise is filtered from the
circuit via the 500 pF capacitor

Tremolo

This
simple circuit can color the sound coming from your audio system. Clocking
for the circuit is provided by an oscillator built from one quarter of a
4093 quad NAND Schmitt trigger. With the component values shown, it will run
at about 5 Hz. The clock frequency is fed to the gain control, pin 8, of an
LM386 amplifier. Tremolo is...

Multi-Instrument Melody Generator UM34811A

This circuit is based on a preprogrammed multi-instrument melody
generator IC, containing a 512-note memory capable of generating 16 tunes. The
comprehensive control facilities enable playing - all tunes repeatedly or
stopping at the end, - or one tune repeatedly or stopping at the end.

Guitar fuzz

The
741 has a maximum gain of 20,000, but the circuit is so designed that the IC"s
gain is 2,700,000 which then distorts the output. This distortion gives the
fuzz effect. The two diodes clip the output to drop the level, also lowered by
the potential divider

Race-car-motor-crash

For
two simultaneous race-car sounds.

Stereo reverb system

The
LM378 dual power amplifier is used as the spring driver. The recovery
amplifier is a low noise dual preamplifier

Audio noise generator

This
simple circuit generates both white and pin noise. Transistor Q1 is used as a
zener diode. The normal base-emitter junction is reverse-biased and goes into
zener breakdown at about 7 to 8 volts. The zener noise current from Q G flows
into the base of Q2 such that an output of about 150 millivolts of white noise
is available. To convert the...

Fuzz box 4

None
of the components are particularly critical in value or quality, as distortion
is the sole object

Micrometronome

This
compact metronome will run for years on a single nine-volt transistor battery.
Has both tone and pulse rate controls, and uses touch plates to start and
stop, can be built in a case no larger than a pack of cigarettes. The touch
plates consist of two strips of metal about 1/16-inch apart mounted on, but
insulated from, the case

Voltage-controlled amplifier or tremolo circuit

The
transistors form a differential pair with an active current-source tail. This
configuration, known technically as a variable-transconductance multiplier,
has an output proportional to the product of the two input signals.
Multiplication occurs due to the dependence of the transistor transconductance
on the emitter current bias

Electronic Bagpipe

The electronic bagpipe mimics the sound of real instruments. This circuit uses
two UJT oscillators and an amplifier (Q3,

Music synthesizer

Three
modes of operation are available in the music synthesizer mode

Low-voltage-compander

The
NE575 is a dual-gain control circuit designed for low voltage applications.
The NE575"s channell is an expander, while channel2 can be configured either
for expander, compressor,

Stylus organ

IC2
is an audio frequency oscillator. Its frequency is primarily controlled by the
resistance between pins 2 and 7. RV4-11 eontrol the oscillator frequency and
by touching a stylus (connected via limiting resistor R5 to pin 2) to each
preset, different notes can be played. ICl is a low frequency oscillator
(approximately 3-10Hz), the frequency...

Linear optocoupler for instrumentation

A
dual optocoupler is used in a configuration which has the same current
throughout as the LEDs. Assuming similar optocoupler features the output
voltage must be equal to the non-inverting input voltage. Since the op amp is
within a closed loop the output voltage becomes equal to the input voltage.

Whooper

Integrated circuit Ul is connected as a low-frequency asymmetrical oscillator.
Its output is inverted by Ql and fed to the reset te

Tone burst generator

The
tone burst generator supplies a tone for one-half second after the power
supply is activated; its intended use is a communications network alert
signal. Cessation of the tone is accomplished at the SCR, which shunts the
timing capacitor CI charge current when activated. The SCR is gated on when C2
charges up to the gate voltage which occurs...

Steam locomotive whistle

The
waveform of a steam whistle is a complex combination of white noise and an
audio frequency oscillation. The noise generator is a transistor (Ql) biased
into zener mode. The audio frequency oscillation is a straightforward mixture
of two similar (but not identical) sine waves, which after their addition
produce a more complex waveshape. The...

Bird chirp

For
a barking dog, the capacitor at pin 17 is changed to 15 pF to increase the
frequency of the VCO.

Noise generator circuit

The
zener diode is an avalanche rectifier in the reverse bias mode connected
toiihe input circuit ofa wideband rf amplifier

Dual Tone Sounder Circuit

An outside horn-type speaker works best with the circuit. However, such
devices require a great deal of power, so this sounder should only be used in
alarm circuits where at least a 6-A SCR is used as the sounder driver. A
single CMOS 4001 quad 2-input NOR gate, two 2N3904 general- purpose npri
transistors, and a single MJE3055 power transistor...

Sound effect generator

This
waveshape generator is basically a slow running oscillator with variable
attack and decay. A variable amplitude (high impedance) output is available
via the 2M potentiometer. B shows an add-on circuit which should be used if a
low impedance output is required

Metronome II

This
simple circuit uses a multivibrator to generate the beats and a subsequent
audio amplifier stage to increase the output level.

Sound-effects-generator

A
variable dock-pulse generator is made up of two sections of IC1 (a 4069 CMOS
hex inverter). Rl, Sl, and capacitors Cl through C6. By adjusting Rl and
switching one of the capacitors into the circuit, the clock"s pulse rate can
be varied over a wide range. The TL507C converts analog signals-in this case
the output of IC3, an LM386 audio...

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